Tom, I'm glad you've experiened Barkhausen noise - it is baffling on first encounter. Actually hearing effects from change of state electron spin is mind-boggling, until you grasp that the audio cortex can hear practically everything. My first exposure was in developing an electric pickup for acoustic instruments which sense geo-location of the string rather than acceleration or electromagnetic changes. We worked it out and the insights gained have remained, as yours have with you.
Isn't audio a trip?